Rock-drilling implement



Pagented Oct. 30, 1888.

.1). KILPATRIGK. ROCK DRILLING IMPLEMENT.

d'y f WITNESSES (No Model.)

Unrrnn STATES Parent flatter...

DANIEL KTLPATRIOK, OF MORNING SUN, lOlVA.

ROCK-=DRlLLlNG IMPLEMENT.

EBPECIPICATION forming part of Letters Patent No. 391,899, dated October 30, 1888.

Application filed December 527, 1887. Serial No. 259103. (No model.)

State of Iowa, have invented a new and 1111- proved Rock-Drillin g Implement, of which the following is a full, clear, and exact description.

My improvements relate to drills used in mining and rock quarrying operations, and have the object to obtain the best results from theexplosive used for blasting, so that there shall be no waste, and smaller charges can be used.

To these ends the invention consists in mechanism, to be hereinafter described and claimed, for reaming out or enlarging drilled holes at the base, so as to form a chamber or pocket for the charge.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a sectional side elevation of the implement with the drills withdrawn. Fig. 2 is asimilar view of the lower part of the same, the view being taken at a right angle to Fig. 1. Fig. 3 is a side elevation of the portion shown in Fig. 2. Fig. 4 is a cross'section on the line at 4 of Fig. 2. Fig. 5 is a cross-section on the line 5 5 of Fig. 2. Fig. 6 is a view illus hating the use and operation of the implement, the lower portion of a drilled hole and of the implement being shown, the latter being in partial section in the plane of Fig. 1, the drills being thrown outward; and Figs. 7 and S are detail views of a modified form of drilling point in two positions.

The cylinder or point A of the implementis made of steel and of a size to fit loosely the drilled hole, and has its lower closed end, a, wedge-shaped or conical. A bore or recess, a, square in crosssection, extends centrally the length of the cylinder and terminates at the upper end in an enlarged circular portion, a, which is screw-threaded. From the base of the bore to extend in opposite directions, curving downward and outward, the grooves a terminating in slots at in the end a of the cylinder, said grooves being at opposite sides of the center of the bore a.

A shank, B, of gas-pipe,threaded at its ends, connects the cylinder A with the internallythreaded central member, 0, of asteel top piece,

0, shaped like an ordinary T-coupling. In the lateral members 0 of the top piece are fitted wooden handles a, by means of which the top piece and cylinder A can be turned. In the top piece, 0, centrally opposite the base of the member 0, isa threaded hole, 0. This top piece, 0, may be removed and a small pinionwheel, 0, placed on the-upper end of the shank or shaft and keyed to the same, by means of which, with suitable gearing, the drill may be more rapidly revolved. Where this wheel and gearing are used, the top of the shank is closed by a nut or cap having in its center the threaded hole a, as in the T-shaped top piece, in which the threaded portion of the fced' rod d works.

A piston or drill holder, E, square in crosssect-ion, is fitted loosely in the bore a of the cylinder A. The piston E consists of two spring steel plates, e, of similar shape, riveted together at c and spaced by being thickened at that point or by a spacing-block interposed between them, as indicated by the dotted lines. In the lower shorter ends. of the plates 6 are aligning apertures 6 The longer upper ends of the plates e are offset or bent inward, as at 6 which offsets have opposite semicircular recesses, e, forming a round aperture extending to the space 6 below the offsets 6 The piston E may be cast in one piece of steel, and the plates 6 reduced by filing to give the proper degree of elasticity.

Between the shorter ends of the plates 6 are pivoted in the piston E, by a rivet passing through their upper ends and the apertures 6 the drills or drilling-points F, which may be flat straight plates provided with a beveled cutting-point, as shown in Figs. 1, 2, and 6, or curved plates with single beveled points, as shown in Figs. 7 and 8, or of any shaperequired for the material being operated on, including tools set with diamond or carbon points in such manner as to operate in granite, quartz, and other like substance.

The feed-rod D is provided with an enlarged pointed head, d, at its lower end, and with an enlarged threaded portion, (1, at the other end, adapted to the aperture 0 of the top piece, 0. Above the threaded portion the rodl is squared to receive a handivheel, G.

The piston E, with the drilling-points, is placed in the cylinder A, the shank and top ICO piece are connected, and the feed-rod entered. through the aperture 0 and its threaded portion screwed a short distance therein, as shown in Fig. 1, whereby the head (1 of the rod will be forced past the offsets 6, with its point in a small recess, e, in the center of the piston and the points of the drills at thejunction of the bore a and the grooves a Now, if theimplement is inserted in a straight hole, 9, until its point rests at the base of the same and revolved by means of the handles c while at the same time the drills are advanced by turning the handle G, the rod D will be advanced, the

' drills will be gradually forced out through the grooves a and the base of the hole 9 enlarged, as shown at g. By turning the rod D in the opposite direction the drills will be withdrawn into the cylinder and the implement can be re moved.

The explosive when placed in the hole will be in a compact form where its explosive force will be utilized to the best advantage and at a point'where the maximum effect will-be ob tained, thereby effecting a great saving by yielding a larger amount of a better product with less amount of poorer material and waste.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a reaming implement, the combination, with the cylinder having openings at in its lower end, of the piston working in said cylinder, and provided with drill points at its lower end to pass through said apertures and with spring-jaws at its upper end, and the drillrod extending into the cylinder and having a head engaged by said jaws.

2. In a reamingimplernent, the piston E, composed of the spring-plates e, spaced and pivoted together at 6, provided with recessed offsets c and apertured at 0 substantially as shown and described.

3. lhe combination of the cylinder A, provided with a square bore-and outwardly-extending grooves, hollow shank B, top piece, 0, having screw-threaded hole a", spring-plates c, pivoted together and spaced at e, apertured at 6 and provided with offsets e, drill-rod D, having head d and enlarged threaded portion d, handwhecl G, and drilling-points F, sub stantially as shown and described.

DANIEL KILIPATRICK.

\Vitnesses:

REUBEN BARKER, B. F. Tnoams. 

